Hi All,

I would like to share this incident that happened the other day.

I have a question with this, create a new VG on SAN and rename FS

And I thought it's related to the above link but the problem was the ibm san 4300 cache battery was dead and I need to click the "disable the write cache" to make it working better. It was so slow when it happening, usually the disk-to-disk backup was one hour, it lasted for 5-6 hours.

You need to check the "write-cache working without battery".

After that the disk I/O is better although there's no cache. My question is why there's no exchange of error regarding the AIX and SAN. I was getting paranoid what was going on when it is happening because there's no error that AIX generate. And I don't have control on the san admin, so today I will ask my boss to give me access on it.

Thanks,
itik

Typically, the DS4300/4700 will send an alert when the cache battery is about to go. I think its about 30 days warning.

The DS should also post errors when the cache is off line.
Do you have the rdac drivers installed correctly?
I don't know because I do not use DS storage, but should there be a health check job in cron like the SSA drivers use?